Often the damage is hidden under overlapping slate courses and becomes apparent only when the roof starts to leak.
Slate roof discoloration.
If your slate is looking a little worse for wear do not be alarmed.
You can also do a fair amount of checking at ground level.
White stains on slate roofs efflorescence or salt stains from rain water sometimes appear on slate shingles.
When cleaning a slate roof don t use chemicals like ammonia or chlorine bleach.
Then spray the cleaner onto the shingles photo 1.
You can spot a sloped slate roof tile more easily from the ground.
Moss often grows in the shade of trees too.
This slate roofing photo series shows all kinds of roofing slate defects.
Take a flashlight and check for water stains on the roof timbers especially after a long period of rain.
Dark black or brown roof shingle stains are often caused by black algae bleed through or extractive bleeding of asphalt dirt soot or organic debris.
The remedies for and means of preventing stains on roof shingles are discussed as well.
You can t walk on a slate roof no matter how shallow its pitch.
Before replacing a slate roof check for isolated damage corroded and worn flashings leaky gutters poor ventilation in the attic and other possible sources of moisture.
Slate roof defect photo library.
If the tiles have water stains check for any hairline cracks.
Buildup of moss and debris on slate roofs hold moisture in the slates that can split them during winter.
But there are other roof stain colors and causes.
Pour it into a pump sprayer strap yourself into a full body harness tie it down and climb to the roof.
Historic slate roofs should be repaired rather than replaced whenever possible.
Also slate is slippery when wet.
Regular roof cleaning is critical for your roof as slate is easy to cleave and water absorbent.
Trees plant debris stains stain patches under trees or nearby may be due to seeds berries leaves and other debris falling and decaying.
That ll prevent the cleaner from drying out too quickly.
Slate is a beautiful and popular medium for fireplaces and patios but it is highly susceptible to stains from water and hard calcified deposited stains under pots and other items.
